ETABS story shear
ETABS story shear
(OP)
Hello guys,
I have a question about the Tortional moment "T" from Etabs - Story shear. The problem is that i dunno how to manual calculate that, let me explain from the start: i calculate and verify in etabs story response the seismic force for every level ( i distributed the base shear on every level). The values are good. Next i calculate the overturning moment "My": Sum of Fi * zi and it checks too ( the values from column My are approximate the same). Next i wanted to calculate the torsion moment "T" are there i got stucked. I took the exccentricity - distance between center of mass and center of rigidity - from etabs - tables and "center..." (e = cm - cr), i even plotted on autocad the points to see if it's ok and it so. So the next thing i did is: Fi * e and it should give the T value but it's not even close, the values from etabs are 10x bigger on every floor level. To give you a numeric example Fi = 70 KN e= 3 m and the T = 10200 about...
What do i miss?
Thank you for your help
I have a question about the Tortional moment "T" from Etabs - Story shear. The problem is that i dunno how to manual calculate that, let me explain from the start: i calculate and verify in etabs story response the seismic force for every level ( i distributed the base shear on every level). The values are good. Next i calculate the overturning moment "My": Sum of Fi * zi and it checks too ( the values from column My are approximate the same). Next i wanted to calculate the torsion moment "T" are there i got stucked. I took the exccentricity - distance between center of mass and center of rigidity - from etabs - tables and "center..." (e = cm - cr), i even plotted on autocad the points to see if it's ok and it so. So the next thing i did is: Fi * e and it should give the T value but it's not even close, the values from etabs are 10x bigger on every floor level. To give you a numeric example Fi = 70 KN e= 3 m and the T = 10200 about...
What do i miss?
Thank you for your help






RE: ETABS story shear
Could it be a math error?
DaveAtkins
RE: ETABS story shear
Accidental eccenttricity is 5% from the lenth so is 0.05 * 26.2 = 1.31m; add them to 3 => e = 4.31 m; 4.31 * 70 = 305.9 kNm and ETABS shows me at T that is 1126.5 kNm ...
RE: ETABS story shear
RE: ETABS story shear
RE: ETABS story shear
RE: ETABS story shear
RE: ETABS story shear
RE: ETABS story shear
RE: ETABS story shear